Hypomyzostoma jonathoni, Summers, Mindi M., Al-Hakim, Iin Inayat & Rouse, Greg W., 2014

Summers, Mindi M., Al-Hakim, Iin Inayat & Rouse, Greg W., 2014, Turbo-taxonomy: 21 new species of Myzostomida (Annelida), Zootaxa 3873 (4), pp. 301-344 : 308-310

Hypomyzostoma jonathoni n. sp. Summers & Rouse

Fig. 3 G–K

Hypomyzostoma crosslandi A—Lanterbecq et al. (2006)

Holotype: SAM E3397 hologenophore (1 spm: 95% ethanol). Snake Pit, Lizard Island, Australia (14° 40.14’S, 145° 34.64’E), 14 m. Collected using scuba on 20 November 2001 by GWR. Genbank (COI—DQ238197).

Host. Dichrometra / Lamprometra / Liparometra sp. 1 (Müller) ( Mariametridae , Comatulida , Crinoidea). SAM K2049.

Paratypes: SIO-BIC A3807/A4024 syngenophore (2 spms: 1spm—95% ethanol, 1 spm—mounted for SEM). Horseshoe Reef, Lizard Island, Australia (14° 41.12’S, 145° 26.31’E), 3 m. Collected using scuba on 20 November 2001 by GWR. Genbank ( COI – KM491747 ). Host: Dichrometra / Lamprometra / Liparometra sp. 1 (Müller) ( Mariametridae , Comatulida , Crinoidea). SAM K2039. Genbank (COI—KM491777). SIO-BIC A4021 syngenophores (3+ spms: 2 juveniles + multiple cysts—in 70% ethanol following fixation in formalin; 1 spm—95% ethanol). Granite Bluff, Lizard Island, Australia (14° 39.07'S, 145° 26.91'E), 15 m. Collected using scuba on 19 March 2000 by GWR. Genbank (18S—KM491764). Host: Dichrometra / Lamprometra / Liparometra sp. 4, SAM K1966; Genbank (COI—GQ913319). SIO-BIC A3833 syngenophore (1 spm: 95% ethanol). Gulewa Village, north Misima Island, Papua New Guinea (10°37'58.7994"S, 152°41'59.9994"E), <20 m. Collected using scuba on 14 August 2006 by GWR. Genbank (COI—KM491748). Host: unknown. SIO-BIC A3825 syngenophore (1 spm: 95% ethanol). Gulewa Village, north Misima Island, Papua New Guinea (10°37'58.7994"S, 152°41'59.9994"E), <20 m. Collected using scuba on 21 August 2006 by GWR. Host: unknown.

Etymology. Named for Jonathan Rouse, brother of GWR, in honor of his birthday.

Diagnosis and description. Holotype body elongate, rounded anteriorly and posteriorly ( Fig. 3 I). Length ~ 2 mm; width ~ 1 mm following fixation. Body margin scalloped, composed of many irregularly-sized triangular cirri ( Fig. 3 K). Mouth and cloaca on ventral surface, subterminal. Extended proboscis smooth. Paired penes in line with third pair of parapodia. Five pairs of acirrate parapodia with hooks. Small lateral organs, alternating with parapodia. Dorsal surface smooth. Color light pink with yellow transverse lines in life, transverse lines faded in preservative.

Remarks. Hypomyzostoma jonathoni n. sp. is most similar to H. crosslandi , H. elongatum , and H. jasoni n. sp. (see remarks for H. jasoni n. sp. above). Hypomyzostoma jonathoni n. sp. can be differentiated from H. jasoni n. sp. by the location of the cloaca and molecular data, and from all of these taxa by host use. Young specimens were recovered in cysts along the hosts’ pinnules. These forms were lightly colored in life ( Fig. 3 I-K) and dark purple in preservative. Paratypes range in size up to ~ 5 mm, in the largest specimen the parapodia are restricted to the anterior-most four-fifths of the body and the color following fixation is light purple with ten dark transverse lines on the dorsal surface.

Figures

FIGURE 3. (A – B) Hypomyzostoma jasoni n. sp. — (A – C) live photographs, (A) non-type (SIO-BIC 4025) on arm of host Stephanometra indica, arrow indicating myzostomid; (B) paratype (SAM E 3398) side profile, showing scalloped margin; (C) paratype (SAM E 3398) dorsal view, showing transverse lines and extended, smooth proboscis; (D – F) SEM of paratype (SAM E 3398), (D) ventral, showing five pairs of parapodia restricted to anterior two-thirds of body and cloaca positioned between last pair of parapodia and body margin; (E) side view, showing smooth dorsal surface and scalloped margin; (F) parapodia with hooks and small cirri buds, indicated by arrowheads. (G – K) Hypomyzostoma jonathoni n. sp. — (G – H) SEM of paratype (SIO- BIC A 4024), (G) parapodia with hook, (H) side profile, showing parapodia with hooks and penis aligned with third parapodia; (I – K) live photographs of paratypes (SIO-BIC A 4026), (I) dorsal view showing transverse lines and smooth extended proboscis; (J) juvenile removed from cyst on arm of host, folded ventral side facing upwards; (K) side profile, showing scalloped margin and range of parapodia. Scalebars 1 mm (A-E); 0.5 mm (I-K); 0.25 mm (J); 100 Μm (F, H); 10 Μm (G) (J); 100 µm (F, H); 10 µm (G).